What do you mean, how would that say something about whether upregulation is occurring?
Since it seems you looked through Cassiopea's documentation, did you per chance come across the papers for the phase I and II Breezula studies? I've tried looking for those, but been unable to find them. Only a paper briefly summarizing both.
Well, loss of effectiveness is what we are seeing, the question is what is the mechanism if not upregulation.
If TAHW decreased at the same rate as TAHC, then we can conclude that miniaturisation was occuring at an accelerated rate. The TAHC drop off could potentially just be vellus hairs that grew between 1-6 month but Breezula was not enough to maintain in long term. AFAIK the previous studies were not 12 months long, so they'd be useless. Just like the Phase 3 will be as that's only going to be 6 months long.